Do you want to completely erase the deleted files on a hard disk and prevent them from being recovered? You can use Disk Redactor to eliminate any traces of files previously deleted, but which are still inside the drive and which could be recovered with special programs.
Disk Redactor installation and use guide: fribby.net/disk-redactor/?lang=en
Official page: cezeo.com/products/disk-redactor/
Free Download Disk Redactor:
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License terms
DiskRedactor may be freely distributed, provided the distribution package is not modified, without written permission from the copyright holder. No person or company may charge a fee for the distribution of DiskRedactor without written permission from the copyright holder.